How to Say "silly" in Spanish
The most common Spanish word for “silly” is “tonto” — use 'tonto' for general, lighthearted foolishness or when describing something as not serious, like a silly joke.
tonto
TON-tohˈtonto

Examples
Fue una broma tonta, pero todos nos reímos.
It was a silly joke, but we all laughed.
No seas tonto, claro que puedes hacerlo.
Don't be silly, of course you can do it.
Me siento tonta por haber olvidado las llaves.
I feel foolish for having forgotten the keys.
Matching the Noun
Like many describing words in Spanish, 'tonto' changes to match the person or thing it's describing. Use 'tonto' for masculine things ('el niño tonto') and 'tonta' for feminine things ('la idea tonta'). For groups, use 'tontos' or 'tontas'.
Forgetting to Change the Ending
Mistake: “La chica es tonto.”
Correction: Say 'La chica es tonta.' Describing words almost always need to match the gender (masculine/feminine) of the noun they describe.
bobo
BOH-bohˈboβo

Examples
Mi hermano es muy bobo; siempre se ríe de sus propios chistes.
My brother is very silly; he always laughs at his own jokes.
No seas tan boba y revisa el contrato antes de firmar.
Don't be so foolish and check the contract before signing.
Fue una idea muy boba salir sin paraguas cuando estaba lloviendo.
It was a very silly idea to go out without an umbrella when it was raining.
Adjective Agreement
'Bobo' must change its ending to match the person it describes: 'bobo' for males and 'boba' for females. Use 'bobos' or 'bobas' for groups.
Confusing Ser and Estar
Mistake: “Using 'estar bobo'.”
Correction: Use 'ser bobo' (to be a silly person in general). You only use 'estar' if someone is temporarily stunned or dazed: 'Estaba bobo después del golpe' (He was dazed after the hit).
estúpidas
Examples
Tus excusas son realmente estúpidas, no te creo.
Your excuses are really stupid, I don't believe you.
locas
LOH-kahsˈlo.kas

Examples
Mis hermanas están locas por el chocolate.
My sisters are crazy about chocolate.
Las ideas que sugirieron eran demasiado locas para el proyecto.
The ideas they suggested were too crazy for the project.
¿Por qué tienes esas caras tan locas?
Why do you have those such wild looks on your faces?
Agreement is Key
Since 'locas' describes feminine plural nouns (like 'chicas' or 'ideas'), it must end in '-as' to match the gender and number.
Gender Mismatch
Mistake: “Las chicas son locos.”
Correction: Las chicas son locas. (The adjective must match the feminine noun 'chicas'.)
ganso
GAHN-soˈɡanso

Examples
¡No seas ganso! Deja de decir tonterías.
Don't be silly! Stop talking nonsense.
Ese chico es un poco ganso, siempre está haciendo bromas.
That boy is a bit of a clown, he's always making jokes.
Se quedó ahí parado como un ganso sin hacer nada.
He just stood there like a lazy fool doing nothing.
Using it as a Noun
Even though it is an adjective, you can use it like a noun by saying 'un ganso' (a silly guy) or 'una gansa' (a silly girl).
Translation Trap
Mistake: “Saying 'él es un ganso' when you mean he is mean.”
Correction: 'Ganso' usually implies someone is silly or lazy, not necessarily mean or evil.
necio
NEH-syohˈnesjo

Examples
No seas necio, sabes que eso no es verdad.
Don't be foolish, you know that isn't true.
Fue una pregunta necia y nadie quiso responder.
It was a silly question and nobody wanted to answer.
A veces los jóvenes cometen errores necios por falta de experiencia.
Sometimes young people make foolish mistakes due to lack of experience.
Describing vs. Acting
Use 'ser necio' to describe someone who is generally a foolish person. Use 'estar necio' to describe someone who is just acting foolishly or being annoying in this specific moment.
Matching the Person
Even though the word ends in 'o', it must change to 'necia' if you are describing a girl or a woman.
The 'Nasty' Trap
Mistake: “Using 'necio' to mean 'nasty' (mean).”
Correction: Use 'desagradable' or 'malo' for 'nasty'. 'Necio' is about being silly or stubborn, not about being mean.
infantil
een-fahn-TEELin.fanˈtil

Examples
No seas infantil, compórtate como un adulto.
Don't be childish; behave like an adult.
Tuvimos una discusión muy infantil sobre quién usaría el control remoto.
We had a very silly argument about who would use the remote control.
Su excusa era tan infantil que nadie la creyó.
His excuse was so childish that no one believed it.
Using 'Ser' vs. 'Estar'
When describing someone's typical personality, use 'ser' (e.g., 'Él es infantil'). If describing a temporary behavior, you might use 'estar' (e.g., 'Hoy estás muy infantil').
Tonto vs. Bobo vs. Estúpido
Related Translations
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